searching for bibliography on world-system theories

Hi,
I am currently doing a review paper on world-system theories (Not only of 
Wallerstein but also others such as Modelski etc) and I need help on locating 
the important resources, debates etc. If anybody has any info about where I can 
find a up-to-date bibliography on world system theories and/or book/article 
reviews I'd be very happy. Thanx in advance.
 
Balkan Devlen